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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44bd9584ade9c82ca5a6910d6bec012f83516a2ca24904a6cdfe893055fc1309' 
  AND token = 'g+5IAEe5BD9gPTto+Cz3pWRleZMoo40m3re+Ic9cCsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}